CZ20021327A3 - Coupling for connecting a pipe adapter to a piping - Google Patents

Abstract

The invention concerns a coupling (10) comprising: a peripheral packing (18) for locking the pipe (14), elastically deformable from a state wherein it has a nominal internal diameter, an external clamping ring (16) directly mounted at the end of the pipe element (12) and enclosing the peripheral packing (18), means (26, 28) for axially stressing the clamping ring (16) towards the pipe fitting (12). It comprises means (70) for maintaining the packing spaced apart with an internal diameter larger than its nominal diameter before the pipe (14) is installed, which maintaining means (70) are releasable when the pipe (14) is mounted.

Description

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling for connecting a pipe extension to a pipe of plastic material introduced into a pipe extension, the coupling forming

- a tube closure circumferential assembly which is adapted to seal the tube and is resiliently deformable in the radial direction until it is released to a nominal inside diameter,

an external shrink mounted on the outside of the pipe extension and surrounding the peripheral assembly, and

means for axially pressing the outer shrink sleeve against the pipe extension, wherein the shroud surfaces and the peripheral assemblies are associated tooth surfaces adapted to provide a concentric pressure of the peripheral assembly on the pipeline by axially compressing the outer shrink against the pipe extension.

The tubular extension may be part of the sewer pipe, the flange connection elements, but also of the sewer accessories such as the elements of the fittings.

Such a connector is intended, in particular, to connect a pipe extension made of cast iron or all other metal materials to a pipe having a smooth surface and in particular to a pipe made of plastic such as poles (vinyl chloride), polyethylene or polypropylene or all other materials.

In addition, such a coupling enables sealing, axial pressing of the pipe against the pipe extension, i.e. mutual axial immobilization of the two connecting elements.

This axial thrust is provided by the eccentric pressure exerted on the peripheral assembly during the axial thrust of the chuck.

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BACKGROUND OF THE INVENTION

Such a coupling is described, for example, in DE 30 02 205. A circumferential assembly comprising a resilient grooved bushing on the inner surface of the hard joining parts is described. This shroud is threaded prior to assembly onto a pipe on which it is held by its resilience when compressing the inner surface of the peripheral assembly against the outer surface of the pipe. In order to secure the closure, the outer shrink bolt is screwed to the pipe element.

The coupling described in this document depends on the correct positioning of the closure assembly on the pipe before it is fed into the pipe extension. This placement is relatively delicate, since it is difficult to predict the exact location of the pipe in the pipe extension before the pipe is introduced into the pipe extension.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coupling which makes it possible to connect a pipe to a pipe extension with a large degree of freedom in their mutual axial position.

SUMMARY OF THE INVENTION

Coupling 10 of the pipe extension 12 with the pipe 14 inserted into the pipe extension 12, consisting of

- peripheral closure assemblies 18 of conduit closure (14), wherein the peripheral closure assembly 18 is adapted to center the conduit 14 and is resiliently deformable in a radial direction until it has a spring-loaded state of nominal diameter,

- an outer shroud 16 mounted on the outside of the tubular extension 12 and surrounding the peripheral locking assembly 18,

and from the projection 26 and from the screw surface 28 to axially pull the outer shroud 16 to the tubular extension 12, the surfaces facing the outer shroud 16 and the peripheral locking assembly 18 represent a continuous toothed surface 36 and other teeth 56A, 56B adapted to apply concentric locking circumferential pressure. of the assembly 18 on the pipe 14 during axial pulling of the outer shroud 16 toward the pipe extension 12.

according to the invention, it has a spacer 70 for retaining the peripheral locking assembly 18 with an inner diameter greater than its nominal diameter before connecting the conduit 14, the spacer 70 being releasable when the conduit 14 is attached.

The invention therefore relates to a pipe-to-pipe connector coupled to a pipe-type of said type having fastening means for holding the assembly in a state with an inner diameter greater than the nominal diameter prior to mounting on the pipe, the fastening means being releasable when the pipe is supported. place.

According to particular embodiments, the coupling has several characteristics - the peripheral assembly has at least one interruption at the periphery and the fastening means have a stationary spacer, initially located in the recess, the spacer having an extension rod extending externally from the socket,

- the assembly has at least two curved and rigid jaws on the circumference and a means of resiliently defining both jaws, compressing them in an open manner,

- the shroud has recesses on its inner surface for the passage of the spacer,

- has elastic means between the closure peripheral assembly and the outside of the pipe extension for axially compressing the assembly to the stop of the extreme end of the pipe extension,

- the resilient clamping means comprise a washer at least partially axially extensible,

- the shroud has an internal throat on which the washer is at least partially axially extensible, »· 9 · · · ·

- the pipe extension has an inner circumferential neck and a seal inserted into the inner circumferential neck,

- the elastic axial clamping means have interlocking screw surfaces arranged in the bore and on the tubular extension,

- the surfaces of the protrusion tooth on the shroud and the peripheral assembly are frustoconical,

the bore has a radial bore for inserting the bore blocking pin relative to the tubular extension, the bore extending transversely of the reservoir to the outlet along the blocking stop of the pin on the surface of the tubing extension when the bore is slid onto the outside of the tubing extension and

and has a pin initially resting on the spacer.

The invention furthermore relates to a method of connecting a pipe extension to a pipe by means of a coupling which it forms

- a circumferential pipe connector which is adapted to center the pipe and is resiliently deformable in the radial direction until release, having a nominal inside diameter větší greater than the outside diameter of the pipe,

- an external shrink sleeve located on the outside of the pipe extension and surrounding the circumferential locking assembly,

- means for axially compressing the chuck towards the tubular extension, surfaces directed against the chaff, and a peripheral assembly representing relative projection teeth adapted to ensure the centering of the assembly against the tubing when the chuck is axially loaded against the tubular extension, according to the invention

- fit a stop assembly with a diameter greater than the outside diameter of the pipe, the assembly being located axially in the coupling,

- the pipe is inserted into the assembly,

- releasing the clamping assembly around the duct

- the shaft is tightened axially to the pipe extension.

The invention is further illustrated by the following exemplary embodiment with reference to the accompanying drawings.

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List of figures in drawings

FIG. 1 is a perspective view of an axial section of a coupling according to the invention when performing a seal;

Fig. 2 is a longitudinal section of the coupling of Fig. 1 in the same condition.

FIG. 3 is an enlarged perspective view of the peripheral closure assembly of the present invention;

Fig. 4 is a perspective view of a spacer according to the invention consisting of a rectangular plate and a locking pin.

Fig. 5 is a section similar to Fig. 2, prior to the closure. Fig. 6 is an enlarged section of the section of Fig. 5 bearing the spacer.

DETAILED DESCRIPTION OF THE INVENTION

The coupling 10 shown in the figures is adapted to provide a connection between the pipe extension 12 and the pipe 14. It is particularly preferred that these elements are of different materials, in particular a pipe extension made of cast iron or any other metallic material and plastic pipes, such as poly (vinyl chloride), poly (ethylene) or poly (propylene) or any other material.

The tubular extension 12 is, for example, a connecting element allowing its end to be connected to a pipe 14 by means of a coupling according to the invention and having, at its other end, for example a flange 15 or any other element suitable for securing a connection with a pipe of the same material. The flange connection of all known types includes the connection between the pipe extension 12 and 5

• Surrounded pipe.

The pipe extension 12 is designed to internally connect the pipe 14. It therefore has a larger inner diameter than the outside diameter of the pipe 14. The pipe of this pipe is inserted inside the pipe extension up to its free end.

The conduit 14 consists of a tube of circular cross-section having an end smooth outer surface free of any protrusions or depressions to ensure proper connection. The pipe 14 at this point of attachment to the tubular extension 12 is a connected end.

The coupling according to the invention relates mainly to a shrink sleeve 16 mounted on the free end of the sleeve 12 and a circumferential closure assembly 18 surrounding the pipe 14. This circumferential closure assembly is retracted centrally by the shrink sleeve 16 when axially tightened to the sleeve 12.

Beyond the free end carrying the shrink sleeve 16, the outer wall of the tubular sleeve 12 has a circumferential bulge 20 extending inside the peripheral neck 22 into which the seal 24 is permanently pressed against the outer surface of the pipe 14. This seal 24 ensures tightness between the pipe 14 and the pipe 12 .

On the outer wall adjacent to the free end, the tubular extension 12 has protrusions 26 allowing the bolt 16 to be screwed to the outside of the tubular extension. These, for example, the four protrusions 26 are adapted to engage the four screw surfaces 28 forming a protrusion on the inner surface of the pinch 16.

The projections 26 and the screw surfaces 28 form screw means allowing, after screwing, the axial pressing of the punch 16 against the pipe extension 12.

The shroud 16 generally surrounds the conduit 14 from the free end of the tubular extension 12, which is surrounded only by the shroud bearing screw surfaces 28.

The shroud 16 has a shoulder 32 at its end facing away from the tubular extension 12, beyond which an annular chamber 34 is defined to partially position the peripheral locking assembly 18.

The notched surface 36 is formed on the outside of the shoulder 32. This notched surface 36 is bent towards the tubular extension 12. Thus, the periphery of the outer casing 32 has a diameter gradually increasing towards the tubular extension 12.

This toothed surface 36 is adapted to engage a complementary toothed surface provided on the peripheral locking assembly 18, which is described in detail below.

Adjacent to, but away from, the outside of the tubular extension 12, the side surface forming the chamber 34 forms an inner throat 38 to allow the elastic elements 40 to be axially compressed by the peripheral closure assembly 18.

These resilient elements 40 comprise at least partially resilient slotted washers. This washer is a slotted support crown 42 formed from a rigid plastic material. The outer peripheral edge of the sliced support crown 42 is inserted into the inner throat 38. The slotted support crown 42 carries an annular pad 44 of resilient material such as foam or rubber on its face facing the tubular extension 12, adjacent to its inner edge. This arrangement is adapted to be fitted on the edge of the tubular extension 12 and extends across the entire slit of the support crown 42. The width of the inner throat 38 is greater than the width of the slit support crown 42, allowing axial compression of the washer at least partially resilient.

As shown more clearly in FIG. 3, the circumferential locking assembly 18 carries two at 1 cylindrical jaw 50ft. 50B coupled together to form a articulated crown. The peripheral closure assembly 18 carries a spacer means comprising, in the present case, a resilient ring 51 centering the two connected half-cylinder jaws 50A, SOB. When mounted on their outer surface, the elastic ring 51 compresses the two jaws centrally.

The FTil cylindrical jaws 50fl, SOB represent the lateral inner half-cylindrical surface 52B, 52B. These surfaces are provided with semi-cylindrical ribs 54A, 54B resting on the ends of each jaw.

On the lateral outer surface, each jaw has a rib surface of a generally interrupted tooth, the inclination of which corresponds to the toothed surface of the surface 36 formed on the shoulder 32.

Behind the surface of the teeth 56R, 56B there is formed a half-cylindrical seat 58R, 58B open outwardly along the length of each jaw and into which the elastic ring 51 fits.

The first teeth projections are brought into contact with each other along a contact line 60 parallel to the axis. This contact occurs along the edge of the two half-cylinder jaws. Both teeth rest on each other along this line.

The other ends of each jaw have a gap 62 therebetween, the width of which varies depending on the spacing of the two jaws. The other ends represent an exterior hinge defining the width of the jaws of the cylindrical support 66A, 66B positioned relative to the support cylindrical surfaces 68 ft, 68B located upstream of these cylindrical supports.

These cylindrical supports are capable of receiving a removable spacer 70 whose side edges are supported on cylindrical supports 66ft, 66B to retain the other ends of both half-cylindrical jaws 50A, SOB against the action of the resilient ring 51. Similarly, the peripheral locking assembly 18 is maintained with inner diameter. greater than its nominal diameter defined when the edges of the two jaws meet.

The spacer 70 is an enlarged scale in FIG. 4. It consists of a rectangular plate 72 of reduced thickness having two parallel edges to be inserted between the cylindrical supports 6GA, 66B. The distance dividing the two side edges is greater than the sum of the widths of the supporting cylindrical surfaces 68Λ, 68B.

At one end, the rectangular plate 72 has a stop 74 forming a abutment adapted to abut the resilient ring 51, which edge forms a rigid substrate for the passage of the elastic ring 52 through the edge 74. At its other end, the rectangular plate 72 passes into material with the body 76 associated with the articulated pull arm. 78. This pull-out arm 78 forms an arch. On the body 76, it is divided into a thinner region 80 forming the hinge.

The body 76 passes into the material with a pin 82 adapted to be inserted into the shroud 16 by a radial bore 83 in the shroud 16, in the region surrounding the tubular extension. This bore. 83 is particularly located near the protrusion 26 when the shroud 16 is screwed to the tubular extension 12 after the clutch has been tightened.

The pin 82 has a longitudinal groove 84 and circumferential ribs 86. The pin 82 is attached to the body 76 at its end. Initially, as shown in Fig. 5, prior to making the joint, the circumferential locking assembly 18 adjoins the chamber 34, surrounds the tubular extension 12.

In this position, each jaw of the peripheral closure assembly 18 is pressed against the toothed surface 36 of the assembly under the action of the assembly. The elasticity of the annular filling 44 of the support crown 40.

The peripheral closure assembly 18 is maintained in the expanded state by the presence of a spacer 70 inserted into the gap 62.

As shown in Fig. 6, the shroud 16 has a recess 92 formed on the periphery thereof formed in a shoulder 32 within which a spacer 70 extending the outside between the jaws defined at the edges of both jaws is located.

The body 76 and the puller arm 78 form a protrusion from the chamber 34, and in particular from the shroud 16.

When the half-cylindrical jaws 50A, 5OB are opened, it is apparent that the connection of the pipe 14 to the tubular extension 12 is facilitated since the throughput of the assembly is smooth, since it has an inside diameter greater than the outside diameter of the pipe 14.

Once the conduit and the pipe extension have been appropriately assembled, the spacer 70 is removed by pulling on the pull arm 78. Thus, the spacer is removed from the recesses 92 When the spacer 70 is pulled out, the two half-cylinder jaws 50Ά, SOB are automatically clamped by the elastic ring 51. Thus they clamp the outer surface of the pipe 14- secured.

To ensure proper sealing of the coupling, the shroud 16 is screwed toward the pipe extension 12 until the surfaces of the complementary teeth of the toothed surface 36 and the teeth 56A, 56BP engage the clamping forces caused by the toothed surface 36 and the teeth 56R, 56B. on both jaws, causing the semi-cylindrical ribs 54A, 54B to partially sink into the outer surface of the conduit 14.

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After screwing the shroud 16, the axially supported crown 42 receiving the abutment on the outside of the tubular extension 12 grips the circumferential locking assembly 18 to the zig-zag surface 36, thereby ensuring sufficient interaction of the contacting teeth.

It will be appreciated that after screwing the shroud 16, axially pressing the peripheral locking assembly 18 of the shroud 16, when fastened around the conduit 14, provides an axial seal between the pipe extension 12 and the conduit 14.

Finally, in order to prevent accidental unscrewing of the pin 16, the pin 82 is inserted into the radial bore 83. Then, in the case of deliberate release, the pin 82 is brought into contact with the projection 26 forming a stop to prevent rotation of the pin 16.

It will be appreciated that the coupling described herein allows simple attachment of the tubular extension to the mating end of the pipe at any relative axial position of the two elements. In fact, the circumferential closure assembly 18 does not fit on the outer surface of the conduit 14 before the axial placement of the tubular extension 12 is correctly positioned.

As a variant, the shroud 16 may be provided with threads to be screwed to the pipe extension 12. It then has an external flange relative to the pipe extension flange. The bolts between the two flanges then secure the axial connection of the shroud with the pipe extension.

Industrial applicability

Coupling, mainly for assembling sewage pipelines, for quick and safe connection of piping to the pipe extension or other part of the fitting.

^á UDr Petr Kaieneký ídvokát _y ^ í ^{EČNÁ ΑθνοκΛ} ™ ί office ALL GREEN SWEETWORK CULAR AND PARTNERS ^{120 00 p} rahfi 2, Hálkova 2 Czech Republic

Claims (10)

PATENT CLAIMS A connector (10) for attaching a pipe extension (121 to a pipe (141) inserted into a pipe extension (121, comprising - a perimeter closure assembly (181) of a conduit closure (141), wherein a perimeter closure assembly (181) is adapted to center the conduit (141) and is resiliently deformable in a radial direction until the spring condition has a nominal internal diameter, - an outer shroud (161 fitted to the outside of the tubular extension (121) and surrounding the peripheral locking assembly (181), - and a projection (261) and a helical surface (281 for axially pulling the outer shrink (161) to the tubular extension (121), the surfaces facing the outer shrink (161 and the peripheral locking assembly (181) represent a continuous toothed yellow surface (361 and other teeth) 56B1, adapted to apply eccentric pressure to the peripheral closure assembly (181) on the conduit (141 during axial pulling of the outer shroud (161) toward the pipe extension (121), having a spacer (701) to retain the peripheral closure assembly (181 with internal diameter) greater than its nominal diameter prior to connecting the conduit (141), the spacer (701) being releasable when the conduit (141) is attached. A clutch according to claim 1, wherein the peripheral locking assembly C181 has at least one gap (621) circumferentially, the means for retaining the peripheral locking assembly (181 being equipped with a stationary spacer (701) initially located in the gap (621) wherein the spacer (701) has a puller arm (781 accessible from the outside of the chuck (161). Coupling according to claim 2, characterized in that the peripheral locking assembly (181 has at least two circular and rigid semi-cylindrical jaws (50A, 50B1) circumferentially and one resilient ring (511) with two outlets gripping it centrally · · · * * »· · · · · · · · · · · · · · · · · · · · · · · · · ······ way. Coupling according to one of Claims 1 to 3, characterized in that the bore (16) carries on its inner surface a recess (92) for the passage of the extension arm (78) of the spacer (70). Coupling according to one of Claims 1 to 4, characterized in that it has elastic elements (40) between the peripheral locking assembly (18) and the outside of the pipe extension (12) for axially compressing the peripheral locking assembly (18) to the extreme end of the pipe extension (12). . Coupling according to claim 5, characterized in that the elastic axial compression elements (40) carry a supporting crown (42) and an annular filling (44) which are at least partially axially extensible. 7. The clutch of claim 6, confesses C c í se by that the bore (16) has an inner throat (38), O covered leans external rim of the supporting crown (42) a annular fillings (44), and les least partially axially extensible. 8. The coupling according to claims 1 to 7, confesses C c í se characterized in that the tubular extension (12) has an inner peripheral neck (22) and a seal (24) housed in the inner peripheral neck (22). Coupling according to one of Claims 1 to 8, characterized in that the axial compression means comprise elements of complementary parts, a projection (26) and a screw face (28) disposed on the chuck (16) and on the pipe extension (12). A clutch according to any one of claims 1 to 9, wherein the continuous toothed surface (36) and the teeth (56A, 56B) disposed on the shank (16) and the peripheral closure closure assembly (18) have stub surfaces. Coupling according to one of Claims 1 to 10, characterized in that the bore (16) has a radial bore (83) for the pin (82) blocking the bore against the pipe extension (12), the bore (83) passing through the bore (16) to releasing along the projection (26) of the locking pin (82) on the surface of the tubular extension (12) when the bore (16) is slid onto the exterior of the tubular extension (12) and secured by axial tightening means which are complementary parts of the projection (26) area (28). Coupling according to one of Claims 1 to 10, characterized in that it has a pin (82) located on the spacer (70). A method of connecting a pipe extension (12) to a pipe (14) inserted into a pipe extension (12) by means of a connector (10), wherein: - the circumferential clamp assembly (18) of the conduit (14) is adapted to center the conduit (14) and is resiliently deformable in the radial direction until release when it has a nominal inner diameter greater than the outer diameter of the conduit (14), - an external shroud (16) mounted on the outside of the tubular extension (12) surrounds the peripheral locking assembly (18), - means, namely the projection (26) and the screw surface (28), - axially compressing the scraper (16) with respect to the pipe extension (12), the scraper (16) and the peripheral locking assembly (18) representing a toothed surface (36) and teeth (56A) , 56B), adapted to ensure the central compression of the peripheral closure assembly (18) on the tire. white (14) axial compression dick (16) to the tubular us t.ave i (12), confesses hearing that se - deploy stop circumferential closing assembly (18) p diameter more than the outside diameter of the pipe (14), whereas peripheral the locking assembly (18) is axially mounted in the coupling (10), - the pipe (14) is inserted into the peripheral locking assembly (18), - releasing the peripheral closure assembly (18) to resiliently retract the pipe (14); - press the shaft (16) axially against the pipe extension (12).